/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package pio.refactor

import org.apache.predictionio.controller.IEngineFactory
import org.apache.predictionio.controller.Engine
import org.apache.predictionio.controller._

class VanillaEvaluator
  extends Evaluator[EmptyEvaluationInfo, Query, PredictedResult,
  ActualResult, Int, Int, String] {

  def evaluateUnit(q: Query, p: PredictedResult, a: ActualResult): Int = {
    q.q - p.p
  }

  def evaluateSet(evalInfo: EmptyEvaluationInfo, eus: Seq[Int]): Int = eus.sum

  def evaluateAll(input: Seq[(EmptyEvaluationInfo, Int)]): String = {
    val sum = input.map(_._2).sum
    s"VanillaEvaluator(${input.size}, $sum)"
  }
}
